[dpdk-dev,12/20] testpmd: introduce parse_vxlan in csum fwd engine

  Move code parsing vxlan into a function. It will ease the support
of GRE tunnels and IPIP tunnels in next commits.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 app/test-pmd/csumonly.c | 68 +++++++++++++++++++++++++++----------------------
 1 file changed, 37 insertions(+), 31 deletions(-)
  

Hi,

> -----Original Message-----
> From: Olivier Matz [mailto:olivier.matz@6wind.com]
> Sent: Friday, January 30, 2015 9:16 PM
> To: dev@dpdk.org
> Cc: Ananyev, Konstantin; Liu, Jijiang; Zhang, Helin; olivier.matz@6wind.com
> Subject: [PATCH 12/20] testpmd: introduce parse_vxlan in csum fwd engine
> 
> Move code parsing vxlan into a function. It will ease the support of GRE
> tunnels and IPIP tunnels in next commits.
> 
> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
> ---
>  app/test-pmd/csumonly.c | 68 +++++++++++++++++++++++++++------------
> ----------
>  1 file changed, 37 insertions(+), 31 deletions(-)
> 
> diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c index
> 0b89d89..52af0e7 100644
> --- a/app/test-pmd/csumonly.c
> +++ b/app/test-pmd/csumonly.c
> @@ -93,7 +93,6 @@ struct testpmd_offload_info {
>  	uint16_t l3_len;
>  	uint16_t l4_len;
>  	uint8_t l4_proto;
> -	uint8_t l4_tun_len;
>  	uint8_t is_tunnel;
>  	uint16_t outer_ethertype;
>  	uint16_t outer_l2_len;
> @@ -191,6 +190,34 @@ parse_ethernet(struct ether_hdr *eth_hdr, struct
> testpmd_offload_info *info)
>  	}
>  }
> 
> +/* Parse a vxlan header */
> +static void
> +parse_vxlan(struct udp_hdr *udp_hdr, struct testpmd_offload_info *info,
> +	uint64_t mbuf_olflags)
> +{
> +	struct ether_hdr *eth_hdr;
> +
> +	/* check udp destination port, 4789 is the default vxlan port
> +	 * (rfc7348) or that the rx offload flag is set (i40e only
> +	 * currently) */
> +	if (udp_hdr->dst_port != _htons(4789) &&
> +		(mbuf_olflags & (PKT_RX_TUNNEL_IPV4_HDR |
> +			PKT_RX_TUNNEL_IPV6_HDR)) != 0)

It seems that there is a bug, which is mbuf_olflags check.
It should be 
(mbuf_olflags & (PKT_RX_TUNNEL_IPV4_HDR |
			PKT_RX_TUNNEL_IPV6_HDR)) == 0).



> +		return;
> +
> +	info->is_tunnel = 1;
> +	info->outer_ethertype = info->ethertype;
> +	info->outer_l2_len = info->l2_len;
> +	info->outer_l3_len = info->l3_len;
> +
> +	eth_hdr = (struct ether_hdr *)((char *)udp_hdr +
> +		sizeof(struct udp_hdr) +
> +		sizeof(struct vxlan_hdr));
> +
> +	parse_ethernet(eth_hdr, info);
> +	info->l2_len += ETHER_VXLAN_HLEN; /* add udp + vxlan */ }
> +
>  /* modify the IPv4 or IPv4 source address of a packet */  static void
> change_ip_addresses(void *l3_hdr, uint16_t ethertype) @@ -356,7 +383,6
> @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
>  	struct rte_mbuf *m;
>  	struct ether_hdr *eth_hdr;
>  	void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
> -	struct udp_hdr *udp_hdr;
>  	uint16_t nb_rx;
>  	uint16_t nb_tx;
>  	uint16_t i;
> @@ -414,33 +440,15 @@ pkt_burst_checksum_forward(struct fwd_stream
> *fs)
>  		/* check if it's a supported tunnel (only vxlan for now) */
>  		if ((testpmd_ol_flags &
> TESTPMD_TX_OFFLOAD_PARSE_TUNNEL) &&
>  			info.l4_proto == IPPROTO_UDP) {
> +			struct udp_hdr *udp_hdr;
>  			udp_hdr = (struct udp_hdr *)((char *)l3_hdr +
> info.l3_len);
> +			parse_vxlan(udp_hdr, &info, m->ol_flags);
> +		}
> 
> -			/* check udp destination port, 4789 is the default
> -			 * vxlan port (rfc7348) */
> -			if (udp_hdr->dst_port == _htons(4789)) {
> -				info.l4_tun_len = ETHER_VXLAN_HLEN;
> -				info.is_tunnel = 1;
> -
> -			/* currently, this flag is set by i40e only if the
> -			 * packet is vxlan */
> -			} else if (m->ol_flags & (PKT_RX_TUNNEL_IPV4_HDR
> |
> -					PKT_RX_TUNNEL_IPV6_HDR))
> -				info.is_tunnel = 1;
> -
> -			if (info.is_tunnel == 1) {
> -				info.outer_ethertype = info.ethertype;
> -				info.outer_l2_len = info.l2_len;
> -				info.outer_l3_len = info.l3_len;
> -				outer_l3_hdr = l3_hdr;
> -
> -				eth_hdr = (struct ether_hdr *)((char
> *)udp_hdr +
> -					sizeof(struct udp_hdr) +
> -					sizeof(struct vxlan_hdr));
> -
> -				parse_ethernet(eth_hdr, &info);
> -				l3_hdr = (char *)eth_hdr + info.l2_len;
> -			}
> +		/* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
> +		if (info.is_tunnel) {
> +			outer_l3_hdr = l3_hdr;
> +			l3_hdr = (char *)l3_hdr + info.outer_l3_len +
> info.l2_len;
>  		}
> 
>  		/* step 2: change all source IPs (v4 or v6) so we need @@ -
> 472,7 +480,7 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
>  			if (testpmd_ol_flags &
> TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM) {
>  				m->outer_l2_len = info.outer_l2_len;
>  				m->outer_l3_len = info.outer_l3_len;
> -				m->l2_len = info.l4_tun_len + info.l2_len;
> +				m->l2_len = info.l2_len;
>  				m->l3_len = info.l3_len;
>  			}
>  			else {
> @@ -482,9 +490,7 @@ pkt_burst_checksum_forward(struct fwd_stream *fs)
>  				   the payload will be modified by the
>  				   hardware */
>  				m->l2_len = info.outer_l2_len +
> -					info.outer_l3_len +
> -					sizeof(struct udp_hdr) +
> -					sizeof(struct vxlan_hdr) + info.l2_len;
> +					info.outer_l3_len + info.l2_len;
>  				m->l3_len = info.l3_len;
>  				m->l4_len = info.l4_len;
>  			}
> --
> 2.1.4
  

Hi Jijiang,

On 02/02/2015 02:49 AM, Liu, Jijiang wrote:
>> +/* Parse a vxlan header */
>> +static void
>> +parse_vxlan(struct udp_hdr *udp_hdr, struct testpmd_offload_info *info,
>> +	uint64_t mbuf_olflags)
>> +{
>> +	struct ether_hdr *eth_hdr;
>> +
>> +	/* check udp destination port, 4789 is the default vxlan port
>> +	 * (rfc7348) or that the rx offload flag is set (i40e only
>> +	 * currently) */
>> +	if (udp_hdr->dst_port != _htons(4789) &&
>> +		(mbuf_olflags & (PKT_RX_TUNNEL_IPV4_HDR |
>> +			PKT_RX_TUNNEL_IPV6_HDR)) != 0)
> 
> It seems that there is a bug, which is mbuf_olflags check.
> It should be 
> (mbuf_olflags & (PKT_RX_TUNNEL_IPV4_HDR |
> 			PKT_RX_TUNNEL_IPV6_HDR)) == 0).

That's correct. Thank you for checking this carefully. I'll
fix this in a v2 patch.

Regards,
Olivier